Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery
Two decades of use of the compulsory selectivity gear configuration in the Northeast Atlantic bottom trawl fishery, which consists of a rigid sorting grid followed by a diamond mesh codend, have revealed problems with performance and efficiency. Size selectivity gear alternatives to this configurati...
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Language: | English |
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Online Access: | https://hdl.handle.net/11250/3033065 https://doi.org/10.1093/icesjms/fsac174 |
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ftimr:oai:imr.brage.unit.no:11250/3033065 2023-05-15T16:19:19+02:00 Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery Brinkhof, Jesse Sistiaga, Manu Herrmann, Bent Grimaldo Vela, Eduardo Enrique Larsen, Roger B. 2022 application/pdf https://hdl.handle.net/11250/3033065 https://doi.org/10.1093/icesjms/fsac174 eng eng Fiskeri- og havbruksnæringens forskningsfinansiering: 901633 ICES Journal of Marine Science. 2022, . urn:issn:1054-3139 https://hdl.handle.net/11250/3033065 https://doi.org/10.1093/icesjms/fsac174 cristin:2073739 14 ICES Journal of Marine Science Peer reviewed Journal article 2022 ftimr https://doi.org/10.1093/icesjms/fsac174 2022-11-23T23:43:05Z Two decades of use of the compulsory selectivity gear configuration in the Northeast Atlantic bottom trawl fishery, which consists of a rigid sorting grid followed by a diamond mesh codend, have revealed problems with performance and efficiency. Size selectivity gear alternatives to this configuration are being pursued, and recent studies of codends with shortened lastridges have reported promising results. In this study, we compared the size selectivity and catch efficiency for cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) caught using a sorting grid with 55 mm bar spacing followed by a 130 mm knotted diamond mesh codend (i.e. the compulsory gear) that same configuration but considering only the catch in the 130 mm diamond mesh codend (regular codend), and an alternative knotless codend with shortened lastridge ropes and a thinner twine. We also addressed the question of whether size-selective gear is even needed to avoid exceeding the bycatch limits of the fishery. Our results demonstrated that the alternative codend improved size selectivity by reducing the loss of fish above minimum legal size (MLS), with a minor increase in the retention of fish below MLS, compared to the compulsory combined grid and codend configuration. The regular codend also reduced the loss of fish above MLS, but the retention of haddock below MLS approached the legal limit of 15% by number. Our results also showed that the abundance of cod below MLS in the fishing area during the trials was low. They also suggested that spatial and seasonal closures in combination with a flexible choice of selection device and modern monitoring tools could be an alternative to rigid enforcement of the use of selective fishing gear. publishedVersion Article in Journal/Newspaper Gadus morhua Northeast Atlantic Institute for Marine Research: Brage IMR ICES Journal of Marine Science 79 9 2399 2412 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Two decades of use of the compulsory selectivity gear configuration in the Northeast Atlantic bottom trawl fishery, which consists of a rigid sorting grid followed by a diamond mesh codend, have revealed problems with performance and efficiency. Size selectivity gear alternatives to this configuration are being pursued, and recent studies of codends with shortened lastridges have reported promising results. In this study, we compared the size selectivity and catch efficiency for cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) caught using a sorting grid with 55 mm bar spacing followed by a 130 mm knotted diamond mesh codend (i.e. the compulsory gear) that same configuration but considering only the catch in the 130 mm diamond mesh codend (regular codend), and an alternative knotless codend with shortened lastridge ropes and a thinner twine. We also addressed the question of whether size-selective gear is even needed to avoid exceeding the bycatch limits of the fishery. Our results demonstrated that the alternative codend improved size selectivity by reducing the loss of fish above minimum legal size (MLS), with a minor increase in the retention of fish below MLS, compared to the compulsory combined grid and codend configuration. The regular codend also reduced the loss of fish above MLS, but the retention of haddock below MLS approached the legal limit of 15% by number. Our results also showed that the abundance of cod below MLS in the fishing area during the trials was low. They also suggested that spatial and seasonal closures in combination with a flexible choice of selection device and modern monitoring tools could be an alternative to rigid enforcement of the use of selective fishing gear. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Brinkhof, Jesse Sistiaga, Manu Herrmann, Bent Grimaldo Vela, Eduardo Enrique Larsen, Roger B. |
spellingShingle |
Brinkhof, Jesse Sistiaga, Manu Herrmann, Bent Grimaldo Vela, Eduardo Enrique Larsen, Roger B. Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
author_facet |
Brinkhof, Jesse Sistiaga, Manu Herrmann, Bent Grimaldo Vela, Eduardo Enrique Larsen, Roger B. |
author_sort |
Brinkhof, Jesse |
title |
Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
title_short |
Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
title_full |
Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
title_fullStr |
Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
title_full_unstemmed |
Managing size selectivity: the relevance of compulsory and alternative selection devices in the Northeast Atlantic bottom trawl fishery |
title_sort |
managing size selectivity: the relevance of compulsory and alternative selection devices in the northeast atlantic bottom trawl fishery |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3033065 https://doi.org/10.1093/icesjms/fsac174 |
genre |
Gadus morhua Northeast Atlantic |
genre_facet |
Gadus morhua Northeast Atlantic |
op_source |
14 ICES Journal of Marine Science |
op_relation |
Fiskeri- og havbruksnæringens forskningsfinansiering: 901633 ICES Journal of Marine Science. 2022, . urn:issn:1054-3139 https://hdl.handle.net/11250/3033065 https://doi.org/10.1093/icesjms/fsac174 cristin:2073739 |
op_doi |
https://doi.org/10.1093/icesjms/fsac174 |
container_title |
ICES Journal of Marine Science |
container_volume |
79 |
container_issue |
9 |
container_start_page |
2399 |
op_container_end_page |
2412 |
_version_ |
1766005699734667264 |